If you want to read from firebase by rule ".read": "auth != null" and you do not want to use firebase api I recommend Retrofit2 library. You have to auth by Bearer service account token.
Warning! The token is valid only for one hour. Then you need to refresh the new token.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
....
//mykey.json you get from FBconsole/Project Settings/service accounts/generte new private key
myFile = new File(mykey.json);
GoogleCredential googleCred = null;
try {
googleCred = GoogleCredential.fromStream(new FileInputStream(myFile));
} catch (IOException e) {
e.printStackTrace();
}
GoogleCredential scoped = googleCred.createScoped(
Arrays.asList(
"https://www.googleapis.com/auth/firebase.database",
"https://www.googleapis.com/auth/userinfo.email"
)
);
try {
scoped.refreshToken();
} catch (IOException e) {
e.printStackTrace();
}
token = scoped.getAccessToken();
Log.d("token ", token);
}//end of oncreate
Button click for read from FB
public void onClick(View view) {
authtoken = "Bearer " + token;
HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
logging.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
httpClient.addInterceptor(new Interceptor() {
@Override
public okhttp3.Response intercept(Chain chain) throws IOException {
Request original = chain.request();
// Request customization: add request headers
Request.Builder requestBuilder = original.newBuilder()
.header("Authorization", authtoken); // <-- this is the important line
Request request = requestBuilder.build();
return chain.proceed(request);
}
});
httpClient.addInterceptor(logging);
OkHttpClient client = httpClient.build();
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("https://yourproject.firebaseio.com")//url of firebase database app
.client(client)
.addConverterFactory(GsonConverterFactory.create())//use for convert JSON file into object
.build();
// prepare call in Retrofit 2.0
FirebaseAPI firebaseAPI = retrofit.create(FirebaseAPI.class);
Call<Event> call2=firebaseAPI.getPrivateData();
call2.enqueue(new Callback<Event>() {
@Override
public void onResponse(Call<Event> call, Response<Event> response) {
Log.d("Response ", "onResponse");
//t1.setText("success name "+response.body().getName());
}
@Override
public void onFailure(Call<Event> call, Throwable t) {
Log.d("Response ", "onFailure");
//t1.setText("Notification failure");
}
});
}
FirebaseAPI.java
public interface FirebaseAPI {
@GET("/uploadprivate/event.json")
Call<Event> getPrivateData();
}
POJO event.java
public class Event {
String name;
String address;
public Event(String name, String address) {
this.address = address;
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
Data in FB console
